Comparing old/new fields in trigger program

[Dave Murvin <davem@xxxxxxxx>]

We will be creating several more trigger programs for some additional data 
files.  Some of these files have hundreds of fields, but we are only 
interested in changes to a small subset of these fields.  Is there a way to 
easily group the fields we are interested in into another data structure 
(besides the new/old record image) so we can determine if there was a 
change we are interested in by comparing two data structures versus 
checking every field we are interested in?  Ideally the field values would 
be sucked into the data structures without having to code the moves.  The 
fields we are interested in are spread throughout the filed and are not 
usually contiguous.

I have tried additional data structures, but program will not compile 
because the fields are already defined in the old/new data structures.  We 
are on V5R1.

Snippet from existing trigger program follows:

 * Record detail for old record
D OldRecordDS   E DS                  ExtName(ECL)
D                                     Prefix(Old)
D                                     Based(OldRecordPtr)

 * Record detail for new record
D NewRecordDS   E DS                  ExtName(ECL)
D                                     Prefix(New)
D                                     Based(NewRecordPtr)

C                   Eval      OldRecordPtr = %Addr(TrigBuf) + OldRcdOff
C                   Eval      NewRecordPtr = %Addr(TrigBuf) + NewRcdOff

Thanks for any suggestions.

Dave Murvin
DRM Enterprises, Inc.